Why can't I plot a graph?

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MH LEE
MH LEE 2013-12-1
编辑： Walter Roberson 2025-3-4
%Hi guys. I am a noob here. I did Matlab and Simulink in Uni before but I am still a noob in it and hope to spent sometime to %learn Matlab. I just wanted to try plot an equation and my script is as follows:
syms x;
y = x^2 + 4*x + 4
plot (y)
%Answer:
>> pl1
y =
x^2 + 4*x + 4
Error using plot Conversion to double from sym is not possible.
Error in pl1 (line 5) plot (y)

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Wayne King
Wayne King 2013-12-1
编辑：Wayne King 2013-12-1
Why do you need to plot this symbolically:
x = -2:0.01:2; % or whatever the range
y = x.^2 + 4*x + 4;
plot(x,y)
If you want to plot symbolically:
syms x;
ezplot(x^2+4*x+4,[-2 2])
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MH LEE
MH LEE 2013-12-1
Okay can can. Accepted your answers :D. than how come if dun put ez cannot plot the graph? Can i say as long anything i use symbolically, must put ez in front?
Johnathon
Johnathon 2025-3-4
What do you do if matlab crashes when you try and plot a graph.

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